Improvement in steam-pumps



UNITED STATES PATENT OFFICE.

TERRITORY. I

` IMPROVEMENT AIN STEAM-PUMPS.

Specification forming part oi' Letters Patent No. 267,226, dated A ugust 20, 1378; application filed May 22, 187s.

To all whom it may concern;

4Be it known that wes vPHILIP VAN TAssEL and MARTIN PAUP, of Port Madison, in the count-yet' Kitsap, Washington Territory, have invented a new and useful Improvement inV Steam-Pumps, of which the following` is a specification Figure 1 is avertical longitudinal section of our improved steam-pump. Fig. 2 is a verti# cal crosssection of the same. Fig. 3 is a top view of the same, the valve-chest being Lait-en away, and shown, partly in section, through the shellV of the cylinder. Fig. 4 is an underside view of the valve-chest.

Similar lettersof reference indicate corresponding parts. i

The object ot this invention is to furnish an improved steam-pump which shall be so constructed that the valve may be operated, Without any gear or other attachment, by the movement of the main piston; to change the position of the valve and reverse the motion Y of the main piston, and which at the same and shall operate with a positive movement.

A represents the cylinder, which is provided with heads and a piston, B, in the usual way. O is the piston-rod, which passes out through the ,stuing-box in'one ot' the heads of the cylinder A in the usual Way. To the upper side of the cylinder A is attached the valve-chest D, the cavity of which is made cylindrical to receive the piston-valve E. The end parts ofthe piston-valve E arel made of such a size as to lit into the cavity of thevalve-chest D, and are packed in the usual Way to prevent the passage of steam. The middle part of the .piston-valve E is made smaller, so that steam may pass around itfreely to-enter the ports F leading from the Y middle part of the said valve-chamber to the end parts of the cylinder A, and which serve-alternately as inlet and outlet ports for the steam.

In the middle part of the bottom ofthe valvechest D is formed the-ex11aust=port Gr, through which the exhaust-steam escapes asl the slidevalve 1I is shifted; The slide-valve H has a central ion gitndinal flange, h', formed upon its upper side to it into the slot in the middle part of the piston-valve E, so that the said valve may hemoved by the movement of the said pistonvalve. The ends of the piston valve E are hollowed out, and from them ports I v lea'd through their lower sides. Fronr the end parts of the valve-chest D ports J lead into the cylinderA at a little distance from its ends, so that the piston B will pass thevsaid ports before reaching the end of its stroke.k Through thebottom of the valve-chest -D are formed ports K, which lead to the exhaust-ports G; to carry oif the exhaust-steam from the ends of the said valve-chest D, as required.

lith this construction, when the parts are in the position shown in Fig. 1 and thepiston B is moving to the right, as the inner end of the port J is uncovered thefsteam passes through the portsJ and Iand forces thepiston-valve E to the left, which covers the rgh't-han'dportJ and uncovers the left-hand port J, 'thel steam escaping` from before the left-hand end of the piston-valve E through -the left-hand port', K. As the piston-valve E Inovesto the left it carries the slide-valve H with it,\vhich admits steam through the righthand port F, in frontof the piston B', reverses its movement, and drives it in the opposite direction. As the piston B reaches the other end of its stroke the same operation is repeated, so that the slide-valve will be moved by the movement of the main piston B. The .upper edge of the ange It' ot' the slide-valve H is notched to receive the end of a lever, L, which is rigidly attachedto a shaft, M, that passes through `the enlarged upper middle attached to its outer end. This device is designedlfor use should the valve H get out of place during the transport-ation of the engine, or from other accidental cause. In all other by the movement of the main piston B.

specified.

PHILIP VAN TASSEL.' MARTIN PAUR Witnesses:

THOMAS F. WILSON,

CYRUs F. ORR.

part of the valvechest D, and has a lever, N,

cases the said slide-valve H will be operated HavingA thus described our invention, weV 

